CIFilter'CIExposureAdjust'中使用的键名'inputEV'的含义是什么?
例如:
CIFilter *exposureFilter = [CIFilter filterWithName:@"CIExposureAdjust"];
[exposureFilter setValue:outputImage forKey:kCIInputImageKey];
[exposureFilter setValue:[NSNumber numberWithFloat:5] forKey:@"inputEV"];
CIImage *outputImage = [exposureFilter valueForKey:kCIOutputImageKey];
答案 0 :(得分:1)
它是曝光值,根据文档:
此滤镜将颜色值乘以如下所示进行模拟 曝光按指定的F挡点改变:
s.rgb * pow(2.0, ev)